Best Convertible Mountain Bike Helmets

Name: Bell Super DH MIPS
Brand: Bell
Price: 199.06 USD
Availability: InStock
Rating: 4.7 (660 reviews)

Researched by Forge. Gear that lasts

Last updated June 15, 2026·8 min read·11 sources cited

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What we'd buy

A convertible mountain bike helmet lives or dies by its latches. After seasons of trail grit, sweat, and the occasional parking-lot drop, the question isn't whether the chin bar passed a lab test on day one. It's whether it still locks in place. The Bell Super DH MIPS is the only helmet here with a true removable chin bar, and it carries the same ASTM F1952 downhill certification as Bell's World Cup race lid. But convertibility adds moving parts, and moving parts eventually wear. If you would rather eliminate that question entirely, the Fox Dropframe MIPS and Giro Tyrant MIPS offer extended 3/4-shell jaw and temple coverage with nothing to unlatch, lose, or break.

Our pick

Best convertible

For riders who need one helmet that transforms between open-face climbs and full-face descents

Bell Super DH MIPS

$199.06 4.7 (660)

Price as of June 15, 2026 · AmazonBuy on Amazon

Best fixed extended coverage

For riders who want 3/4-shell protection with nothing to unlatch, lose, or break

Fox Dropframe MIPS

$224.95 4.2 (27)

Price as of June 15, 2026 · AmazonBuy on Amazon

Section 2 of 6

How they compare

How the three helmets compare on the specs that matter for long-term ownership.
Product	Price	Rating	Removable chin bar?	Weight (medium, as worn)	Key safety certification	Vent count	Retention system	Price
Super DHPick	$199.06	★ 4.7 · 660	Yes, 3-latch system	477g half-shell / 883g full-face	ASTM F1952 DH certified	19 vents plus 2 brow ports	Float Fit DH indexed dial	$199
Tyrant	$174.95	★ 4.3 · 96	No, fixed 3/4-shell coverage	622g	MIPS Spherical; exceeds EN 1078 CE	14 with internal channelling	Roc Loc Air DH sawtooth dial	$175
DropframePick	$224.95	★ 4.2 · 27	No, fixed 3/4-shell design	654g	NTA-8776 E-bike; 5-star Virginia Tech	19 with Big Bore front ports	BOA dial with full-circumference wire	$225

black mountain bike on brown field during daytime — Photo by Jay Miller on Unsplash

Section 3 of 6

Which one's for you?

Is this you?

You race enduro and need DH-certified protection on demand

The Bell Super DH is the only helmet here that meets the ASTM F1952 standard, which many enduro race organizers require. Pedal up in 477g half-shell mode, then clip the chin bar on for the timed stages. The three-latch system gives a reassuring snap, but expect to pull the helmet off to attach it — BikeRadar notes it is a little fiddly to do while wearing it.

Bell Super DH MIPS

$199.06 · View on Amazon

→

Is this you?

You want fewer failure points and the coolest-running lid on long summer rides

No latches, no hinges, no chin bar to lose. The Fox Dropframe delivers full-face levels of back-of-head and temple coverage with zero convertibility compromises. MBR found it runs much cooler than the Giro Tyrant, and at trail speed there is a noticeable draft right above the ears. If you live somewhere hot and climb often, this is the pick.

Fox Dropframe MIPS

$224.95 · View on Amazon

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Is this you?

You want the lowest price for MIPS Spherical extended coverage

At $175, the Giro Tyrant is the most affordable way into MIPS Spherical — the same dual-layer ball-and-socket tech found in helmets costing over $100 more. Bike Perfect calls the fit fantastic straight away across multiple head shapes. The trade-off: it can get pretty warm on long, slow climbs and the cheek pads may not contact every face.

Giro Tyrant MIPS

$174.95 · View on Amazon

→

Is this you?

You split weekends between bike park laps and local trail loops

One helmet, two jobs. The Bell Super DH gives you a DH-certified full-face for lift-served days and a well-vented half-shell for weekday trail rides. The chin bar alone accounts for almost half the total weight of the helmet, so stashing it in a pack between runs is manageable. BikeRadar confirms it is comfortable on your head, and venting in its full-face configuration isn't too bad at all.

Bell Super DH MIPS

$199.06 · View on Amazon

→

black and orange camera on black tripod — Photo by Tim Foster on Unsplash

Section 4 of 6

Meet the contenders

Best for riders who want a true two-in-one convertible with…

Bell Super DH MIPS

$199.06 · ★ 4.7 · 660 reviews

→Three-latch chin bar system meets ASTM F1952 downhill standard, the same certification as Bell's Full-9 World Cup helmet
→MIPS Spherical uses two foam layers connected by elastomers, allowing a few millimetres of movement in any direction to reduce rotational forces
→883g full-face, 477g half-shell: lighter than the Giro Switchblade in both modes by a meaningful margin

What buyers and reviewers are saying

Meets ASTM F1952 downhill standard in full-face mode — the same certification as Bell's Full-9 World Cup helmet.

BikeRadar

Uses a Fidlock magnetic buckle — not a D-ring — which can theoretically come undone during a crash at the wrong angle.

MBR / The Loam Wolf

The thin straps twist quite easily and loosen off in use, so they need regular checking.

OutdoorGearLab

Weight has crept up by over 150g compared to the previous Super 2R, but the DH version feels much sturdier for it.

BikeRadar

It's worth whipping the Super DH off your head to fit the chin bar though, because it's a little fiddly.

BikeRadar

View on Amazon · $199.06Price as of June 15, 2026 · Amazon

Section 5 of 6

What we still don't know

These are the durability questions the current crop of reviews cannot answer — the kind that only surface after multiple seasons of hard use.

How do the Bell Super DH chin bar latches hold up after three or more seasons?
No long-term durability data exists in the current review corpus. Latches that snap firmly on day one may develop play as plastic wears against plastic. A multi-season teardown or owner survey would surface whether the locking mechanism degrades meaningfully over time.
What is the actual crash replacement policy across these three brands?
None of the reviews in the corpus document whether Bell, Giro, or Fox offer discounted crash replacement — a critical factor when evaluating a helmet as a long-term investment. Direct outreach to each manufacturer would fill this gap.
Does the Fidlock magnetic buckle on the Bell and Fox hold up in gritty, muddy conditions over multiple seasons?
Testers note the Fidlock buckle can theoretically come undone at the wrong angle, but no review tracks whether fine grit intrusion causes the mechanism to bind or weaken after repeated exposure to wet, dirty trail conditions.

Section 6 of 6

Before you go

None of these fit?

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What people Google next

Is a convertible helmet as safe as a dedicated full-face?: It depends on the certification. The Bell Super DH meets the same ASTM F1952 downhill standard as Bell's Full-9 World Cup race helmet when the chin bar is attached, so in a certified convertible the protection is legitimate. However, BikeRadar notes the Super DH is not quite as solid-feeling as the Giro Switchblade, and any helmet with removable parts introduces potential failure modes that a one-piece full-face eliminates. For occasional bike park use, a certified convertible is sufficient. For dedicated downhill, a fixed full-face still inspires more confidence.
Can you attach the Bell Super DH chin bar while wearing the helmet?: Technically yes, but BikeRadar advises against it. The review notes it is a little fiddly and recommends taking the helmet off to attach the chin bar. The three latches — one at each temple and one at the rear — need precise alignment to snap securely. Doing this blind while the helmet is on your head increases the chance of a latch that looks closed but is not fully engaged.
What is the difference between a convertible helmet and a 3/4-shell helmet?: A convertible helmet like the Bell Super DH has a fully removable chin bar, letting you switch between open-face mode (around 477g) and full-face mode (around 883g). A 3/4-shell helmet like the Fox Dropframe or Giro Tyrant has a fixed shell that extends down over the ears and temples for extra side and rear coverage, but it has no chin bar at all. You trade the option of full-face protection for a simpler, lighter build with fewer parts to maintain or break.
Does the Bell Super DH's Fidlock magnetic buckle pose a real safety risk?: The concern is documented: testers at MBR and The Loam Wolf note the Fidlock buckle can theoretically come undone during a crash at the wrong angle, unlike a traditional D-ring closure. The straps also twist quite easily and loosen off in use, which can make the buckle harder to align. In practice, no reviewer reports an actual failure during testing, but the concern is worth weighing if you prioritize absolute security over one-handed convenience.
Which helmet vents best for hot-weather climbing?: The Fox Dropframe is the clear winner. MBR found it runs much cooler than the Giro Tyrant, and its 19 vents with Big Bore front ports create a noticeable draft right above the ears at trail speed. The Bell Super DH in half-shell mode breathes well enough for all-day rides but its vents aren't particularly large compared to the competition. The Giro Tyrant's 14-vent layout can still get pretty warm on long slow climbs, though Bike Perfect notes it is cooler than Giro's own Switchblade when that helmet is used without its chin bar.
Do I need a DH-certified helmet for regular trail riding?: No, but it depends where you ride. If you stick to flow trails and cross-country loops, a standard trail helmet with MIPS is sufficient. If your local trails involve high-speed descents, rock gardens, or mandatory gaps, the extra assurance of an ASTM F1952 certification is worth considering. Many enduro race organizers now require DH-certified helmets, and the Bell Super DH is the only helmet in this comparison that meets that standard in full-face mode.